Heat blow gun



Dec. 24, 1963 H. E. MELTZER HEAT BLOW GUN Filed Oct. 13, 1960 INVENTOR HENRY E. MELTZER United States Patent O 3,115,567 HEAT BLW GUN Henry lll. lt/leltzer, ldth and Flett tits., Racine, Wis. Filled Get. 13, 1966i, Ser. No. elfi/lil a claims. (ci. zia-39) This invention appertains to heat guns and more particularly to a novel device lor applying a localized heat in the form of a blast of hot air to a specilic point for any desired purpose.

`One of the primary objects of my invention is to provide a heat blow gun for `facilitating the removal of paint from an old surface by applying .a 'blast of hot air to the paint for blistering or melting the paint, so that the paint can be quickly scraped ot without burning or otherwise injuring the surface.

Another salient object of my invention is the provision of a heat blow Agun hav-ing connected to its nozzle a heat retaining pan for engaging over a desired area of a surface for distributing the heat `over said surface and conlining the heat thereto, whereby to quickly affect the paint or similar surface.

A further important object of my invention is the provision of an electrical heating unit directly -within the pan as well as the heating unit in the blow gun nozzle, so as to insure the correct heating of the yair over the entire area covered by the pan.

A further important object of the invention is to provide a llexible connection between the plan and nozzle, whereby the pan lcan conform itself to the inclination of such surface relative to the gun.

A still further object `of my invention is to provide a heat blow gun of the above character, which will be durable .and ei'licient in use, one that will be simple and easy to manipulate and one that will be light in weight and convenient to handle.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described and cla-imed and illustrated in the accompanying drawings, in which drawings,

FIGURE l is a side elevational view of my improved heat `gun with the heat confining pan connected therewith, the pan and adjacent parts being shown in cross-section, with the nozzle of the gun partly broken :away to show the electrical heating unit with the nozzle, and

FIGURE 2 is a bottom plan view eof my improved device.

yReferring to the drawing in detail, wherein similar reference characters designate corresponding parts throughout the sevenal views, the let-ter B generally indicartes my heat blow gun and the same includes a body 5 having la manipulating handle e at one end and an outlet head 7 at its opposite end, and preferably at right angles to the manipulating handle. he body 5 includes an electric motor 8 for driving an air impeller tor forcing air through the loutlet head '7. In accordance with my invention the outlet head 7 has secured thereto an elongated outlet nozzle 9, and the nozzle 9 has incorporated therein an electric heating unit lltl. Thus, air forced through the nozzle lll will be heated to the desired degree. The body 5 adjacent to the manipulating handle 6 is provided with an electric control switch lil.

The nozzle 9 enters centrally into a heat confining pan l2 and the pan l2 is connected to the nozzle 9 through the medium `of a flexible joint 13, which will be later set forth.

The heat corrlining pan l2 can be of any desired configuration, but as illustrated, the same is of a square shape in plan. The pan includes a top wall ld `and depending side walls l5. rPhe lower edges of the side walls can be Fice Aie

rolled to provide a smooth flange or bead le, it such should be desired. The walls are cut away at spaced points along their lower edges to provide air escape openings i7.

As stated the nozzle 9 enters centrally into the top of the pan and the pan is provided with an enlarged central opening l for receiving the nozzle.

The llexible joint connection i3 between the pan and nozzle can take various forms and for the purpose of illustration l have shown this connection to include upper and lower caps 19 and Ztl, which receive a smooth resilient packing such las asbestos 2l, and this packing can be in the form of asbestos sheets. rlhe walls of the opening i8 4are received within the packing and the top wall extends into the packing and is supported thereby The lower cap 2li is held in place by a cross-pin 22 and the upper cap `lill is held in place by an expansion coil spring 23. The lower end of the spring engages the outer face of the cap l@ and the upper end of the spring engages a washer 24- loosely fitted on the nozzle and held in place by :a cross-pin 25. The packing is somewhat loose and resilient land is held in place resiliently by the spring 23 and thus the pan can give or slant in all directions.

From the description so lar, it can be seen that the pan is placed against a surface at Ia desired point wherever high temperature heat is needed, and upon closing the circuit through the motor 3 and the resistance coil or electric heating unit lll, a hot blast of air will be delivered to the interior of the pan and this hot air will be distributed over the entire area of the plan and somewhat confined therein, but obviously the air can escape through the wall openings i7.

Where exceptionally high degrees of heat are desired or at winter time working outdoors, an electrical heating unit Z6 can be carried directly by the pan. This unit is wound around porcelain or like studs Z7 carried by the top wall liti of the pan. lf desired, the circuit for the heating unit 26 can be controlled by a separate switch or the same can be controlled by the same switch 1l.

From the foregoing description, it can be seen that I have provided an eiiicient means for delivering hot, hea-ted air to a localized point `for `any purpose, but particularly for boiling, blistering or heating paint to soften the same to permit the easy removal thereof from an old surface. The device is also particularly useful in heating asphalt tile `and the like incident to laying a lloor.

The pan can be formed from sheet metal and the entire unit is of light weight and can be easily manipulated by an operato-r, and the pan will conform itself to the inclination of a surface although the handle 6 may not be at `direct right angles to the nozzle. The pan is pressed against the surface with a small force and no great pressure is needed.

ln order -to insure the desired rocking motion of the pan 12 in all directions, a concavo-convex washer 2S can be secured to the nozzle 9 and the wall of the opening in the pan l2 can be flanged upwardly on a `nadius, as at 29, to seat against said washer for a sliding rocking action.

Stress is laid on the -f-act that the exible coupling 13 is disposed directly at the point of the entrance of the nozzle 9 into the pan l2 and that the pan rocks directly on the nozzle. This permits a desired thrust to be transmitted `directly to the pan, but still permits the pan to flex to a limited extent on the nozzle. The nozzle itself extends a considerable distance into the pan for insuring the liow of heated air into the pan.

Changes in details may be made without departing from the spirit or the scope of this invention, but what I claim as new is:

1. A device for applying high temperature air to a surface comprising a blow gun including la manipulating handle and an outlet nozzle for air, an electrical heating unit within the nozzle past which the air travels, a heat confining pan having a top wall receiving the outlet end of the nozzle, and `a flexible connection between the top wall of the pan and the nozzle, said flexible connection including upper and lower conlining caps disposed respectively above and below the top wall, llexible packing material between the caps receiving and supporting the top wall of the pan, means retaining the 4lower cap on the nozzle, a stop confined on the nozzle above the pan, and lan expansion spring coiled around the nozzle engaging the upper oap and the stop for normally holding the llexible packing material under tension and in said caps.

2. A mobile device for applying high temperature air to a surface for removing paint and the like therefrom compnising a substantially rectangular shaped heat conning pan Iincluding a top wall and outwardly extending peripheral side walls for engaging the surface to which the heat is being applied, a blow gun having an outlet nozzle extending into the pan a substantial distance through the top wall for conducting air into the pan,

means for securing the pan directly to the nozzle, means for heating the air delivered by the blow gun, a handle on the blow gun for manipulating the gun and attached pan over the surface to which the heat is being applied, and said means connecting the pan directly with the nozzle being llexible whereby the pan can be swung on the nozzle to accommodate itself to the surface to which the heat is being applied.

References Cited in the file of this patent UNETED STATES PATENTS 1,707,554 Hendry Apr. 2, 1929 1,765,380 McGinnis lune 24, 1930 1,787,251 Jancke et al. Dec. 30, 193() 2,150,720 Mullooly Mar. 14, 1939 2,597,215 Wright May 20, 1952 2,675,459 Piace Apr. 13, 1954 3,007,256 Rouy Nov. 7, 1961 FORElGN PATENTS 622,374 Germany Oct. 26, 1936 772,033 Great Britain Apr. l0, 1957 

1. A DEVICE FOR APPLYING HIGH TEMPERATURE AIR TO A SURFACE COMPRISING A BLOW GUN INCLUDING A MANIPULATING HANDLE AND AN OUTLET NOZZLE FOR AIR, AN ELECTRICAL HEATING UNIT WITHIN THE NOZZLE PAST WHICH THE AIR TRAVELS, A HEAT CONFINING PAN HAVING A TOP WALL RECEIVING THE OUTLET END OF THE NOZZLE, AND A FLEXIBLE CONNECTION BETWEEN THE TOP WALL OF THE PAN AND THE NOZZLE, SAID FLEXIBLE CONNECTION INCLUDING UPPER AND LOWER CONFINING CAPS DISPOSED RESPECTIVELY ABOVE AND BELOW THE TOP WALL, FLEXIBLE PACKING MATERIAL BETWEEN THE CAPS RECEIVING AND SUPPORTING THE 